894873999587681 has 2 divisors, whose sum is σ = 894873999587682. Its totient is φ = 894873999587680.

The previous prime is 894873999587669. The next prime is 894873999587683. The reversal of 894873999587681 is 186785999378498.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 725018038493281 + 169855961094400 = 26926159^2 + 13032880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-894873999587681 is a prime.

It is a super-2 number, since 2×894873999587681² (a number of 31 digits) contains 22 as substring.

Together with 894873999587683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (894873999587683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 447436999793840 + 447436999793841.

It is an arithmetic number, because the mean of its divisors is an integer number (447436999793841).

Almost surely, 2^{894873999587681} is an apocalyptic number.

It is an amenable number.

894873999587681 is a deficient number, since it is larger than the sum of its proper divisors (1).

894873999587681 is an equidigital number, since it uses as much as digits as its factorization.

894873999587681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 474054819840, while the sum is 101.

The spelling of 894873999587681 in words is "eight hundred ninety-four trillion, eight hundred seventy-three billion, nine hundred ninety-nine million, five hundred eighty-seven thousand, six hundred eighty-one".